The Wankel engine, most notably the Mazda Rotary could be considered as a sleeve valve type.
I like the sound and fury of the Napier Sabre, sound files can be downloaded from the net.
Sleeve valves have tremendous advantages in air and exhaust flow, but alas, have many sealing and heat flow problems too.
So far, only the Wankel engine has held up enough to be any kind of commercial success, and continue on to second and third generation, with increased lifespan, power and fuel economy.
It is mass produced, where historical sleeve valve engines required much hand fitting.
Today, CNC machining can provide the tolerance, maybe combined with new lubricants and material science....
I like to see advances in power engineering. I hope something good comes from their effort.